Conductive ceramics

Beta alumina

Ionotec manufactures ion-conductive ceramic membranes in various shapes and sizes. The conductive ceramic
material is usually beta-alumina, a hard dense polycrystalline ceramic in which the mobile ion may
be sodium (Na+), potassium (K+), silver (Ag+), lithium (Li+), strontium (Sr2+), barium(Ba2+) or gadolinium
(Gd3+). Other types of conductive ceramic may be possible. Most applications of beta-alumina ceramics
require conductivity to sodium (Na+) or to potassium (K+). For both types of conductive ceramic we can supply
beta-alumina ceramics stabilized either with lithium or with magnesium, with or without zirconium oxide added
as a strengthening agent. Ceramic membranes are available as thin-walled tubes, flat discs, or flat
plates.

Dimensions

Beta-alumina tubes can be supplied fitted with insulating ceramic headers. Prices are dependent on
quantity, type and fittings. Standard product dimensions are shown in the tables below; Ionotec's manufacturing process is quite flexible and adaptable to individual
requirements.

Tubes, one end closed

Part No.

Length (mm)

Internal diameter (mm)

Wall thickness (mm)

A1

70

6.5

0.5-1.5

A2

105

13

0.5-1.5

H1

40

20

1-2

H3

80

20

1-2

B1

100

28

1-2

B2

220

29

1.5-2

R1

330

45

2

C2

220

52

2

C3

330

52

2

Flat discs and plates

Part No.

Diameter/length (mm)

Thickness (mm)

D1

20

1

D2

45

1.5

D3

70

2

Properties of beta alumina

Some properties of Ionotec ion-conductive beta-alumina ceramics are shown below.

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